Demonstration device



FIG. 1 is a front perspective view of a demonstration device showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in the interior of the rectangular area of the chute portion of the demonstration device shown in FIG. 7 are included for the purpose of illustrating a portion of the demonstration device that forms no part of the claimed design. 

The ornamental design for a demonstration device, as shown and described. 